When going to a hot country that has a reputation for mosquitoes & nits, what goes on first? Sun block over insect repellent, or the other way round? Thinking like, if you put for arguments sake, the repellent over the sun block, then the sun block wouldn't work? Or sun block over the repellent, get eaten alive as the sun block is covering the repellent? Or perhaps the mosquitoes/nits wont like the taste of sun block, so just use that?